Sidney
Incorporated 1792Named for Sir Philip Sidney, the 16th-century English poet and soldier. It was set off from Vassalboro.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoSidney’s vote. Click a question for the statewide comparison.How Sidney Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Sidney votes from the state.
Turnout in general elections
Ballots cast divided by active registered voters on election day. List maintenance shrinks the denominator in some years (for example 2022), which pushes the rate up.
Who Lives Here
American Community Survey 2020–2024Sidney at a Glance
Sidney is a town in Kennebec County, Maine, incorporated in 1792. It has an estimated 4,929 residents (2025), compared with 4,645 in the 2020 Census.
It is part of Congressional District 2, State Senate District 15, State House District 61 (94% of residents), State House District 66 (6% of residents), and County Commissioner District 1, in the Central Maine region.
In the 2024 presidential race, Donald Trump carried Sidney with 59.8% to 38.5% for Kamala Harris. That was a Republican margin of 21.3 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Paul LePage carried Sidney with 58.2% to 40.3% for Janet Mills. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Sidney with 45.9% to 45.2% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 212th most Republican of 504 towns.
As of March 7, 2026, Sidney had 3,315 active registered voters: 22.1% Democrats, 43.2% Republicans, 30.4% unenrolled, and 3.8% Green Independents. The median household income is $83,488 and the median home value $336,200, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 1868 (with county figures from 1821), voter registration since 1954, referendum votes, turnout, and Census and American Community Survey figures. Sources are listed at the foot of the page and on the Data Sources page.